What’s the difference between Limestone and Sandstone?

A brief overview of Limestone and Sandstone compositions

Limestone

  • Is a sedimentary rock composed largely of the minerals calcite and aragonite, which are different crystal forms of calcium carbonate (CaCO3). Limestone is predominately quite light (cream) in colour but can range into biscuit and honeycomb colours
  • Our Mount Gambier Limestone (fossiliferous limestone) is located and quarried from the Marte deposits, 10km west of Mount Gambier in the South East of South Australia
  • The stone originated from extensive colonies of bryozoa (or lace coral) that flourished on an open-marine shelf, formed over 30 million years ago. Its composition consists of bryozoa, foraminifea and echinoid spines and plates

 

Sandstone

  • Is a clastic sedimentary rock composed mainly of sand-sized minerals or rock grains
  • Most sandstone is composed of quartz and/or feldspar because these are the most common minerals in the Earth’s crust. Like sand, sandstone may be any colour, but the most common colours are tan, brown, yellow, red, grey, pink, white and black
  • Sandstone is converted into quartzite through heating and pressure usually related to tectonic compression within orogenic belts